I am going on my first ride with others tomorrow. It is a charity event ride. I am completely clueless about what is considered normal for these things. It has a short route option that I am taking, that is 28 miles.

Do I show up wearing my gear?
They have a place there that I could change.

There is a lunch afterwards. Should I change into street clothes before that?

I have a hydration pack that I like to wear for my personal riding even if I am not going a long way. Would that be considered odd? I expect the short route to take me @2 hrs.

Is there anything else I should know about riding with others? I have always ridden by myself.